AIFM1 and Friedreich ataxia: Considering postlingual-onset AN, many syndromic forms that cause sensory and motor neuropathy have been documented, including Charcot-Marie-Tooth disease, Friedreich’s ataxia, deafness-dystonia-optic neuropathy (DDON) syndrome, autosomal dominant optic atrophy (ADOA), and AUNX1 due to AIFM1 gene mutations in apoptosis-inducing factor (Han et al., 2017).